Professional SQL Server 2012 Internals and Troubleshooting
Christian Bolton, Rob Farley, Glenn Berry, Justin Langford, Gavin Payne
Format: PDF / Kindle (mobi) / ePub
Hands-on troubleshooting methods on the most recent release of SQL Server
The 2012 release of SQL Server is the most significant one since 2005 and introduces an abundance of new features. This critical book provides in-depth coverage of best practices for troubleshooting performance problems based on a solid understanding of both SQL Server and Windows internals and shows experienced DBAs how to ensure reliable performance. The team of authors shows you how to master the use of specific troubleshooting tools and how to interpret their output so you can quickly identify and resolve any performance issue on any server running SQL Server.
- Covers the core technical topics required to understand how SQL Server and Windows should be working
- Shares best practices so that you know how to proactively monitor and avoid problems
- Shows how to use tools to quickly gather, analyze, and effectively respond to the source of a system-wide performance issue
Professional SQL Server 2012 Internals and Troubleshooting helps you to quickly become familiar with the changes of this new release so that you can best handle database performance and troubleshooting.
in the last second Sends to Replica/sec Total sends to the availability replica Sends to Transport/sec Total sends to transport for the availability replica Batch Resp Statistics Batches >=000000ms & <000001ms Number of SQL Batches with a response time greater than or equal to 0ms but less than 1ms Batches >=000001ms & <000002ms Number of SQL Batches with a response time greater than or equal to 1ms but less than 2ms Batches >=000002ms & <000005ms Number of SQL Batches with a response time
collection script from Management Studio or use the sqlcmd –W parameter if you are capturing the data using sqlcmd. The –W ensures that trailing spaces from the result sets are removed. Writing Your Own Queries If you still want to go that extra mile with SQL Nexus, you can write your own T-SQL queries to fetch and aggregate the data available in the SQL Nexus tables. The following query returns an aggregation of the SUM of all the CPU/Duration/Reads/Writes that completed execution during the
attention to your physical core counts and the relative performance and scalability you get for each physical core. You are likely to be stuck with the processor(s) you choose for the lifetime of the server, which is probably several years, so choose wisely. Choosing wisely means getting the most performance and scalability with the lowest total physical core count in the server. Choosing poorly means getting less performance and scalability but paying the same or a higher total cost for your SQL
find a good plan in a reasonable amount of time, rather than the best plan. The optimizer’s goal is most commonly described as finding the most efficient plan. If the Optimizer tried to find the “best” plan every time, it might take longer to find the plan than it would to just execute a slower plan (some built-in heuristics actually ensure that it never takes longer to find a good plan than it does to just find a plan and execute it). As well as being cost based, the Optimizer also performs
query will scan the index and be blocked by the uncommitted update in Session 1: /* SESSION 2 */ USE AdventureWorks2012; SELECT FirstName ,LastName FROM Person.Person WHERE LastName Like 'Raheem%'; Return to Session 1 and move Bethany Raheem, who has already been read, to a position in the index after the row being updated in Session 1: /* SESSION 1 PART 2 */ UPDATE Person.Person SET LastName = 'Raheem_DOUBLE_READ_REAL' WHERE LastName = 'Raheem' AND FirstName = 'Bethany'; COMMIT TRAN; The range